CA2252888C - Creping blade - Google Patents
Creping blade Download PDFInfo
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- CA2252888C CA2252888C CA002252888A CA2252888A CA2252888C CA 2252888 C CA2252888 C CA 2252888C CA 002252888 A CA002252888 A CA 002252888A CA 2252888 A CA2252888 A CA 2252888A CA 2252888 C CA2252888 C CA 2252888C
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- wear
- cylinder
- blade according
- creping blade
- blade
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31F—MECHANICAL WORKING OR DEFORMATION OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31F1/00—Mechanical deformation without removing material, e.g. in combination with laminating
- B31F1/12—Crêping
- B31F1/14—Crêping by doctor blades arranged crosswise to the web
- B31F1/145—Blade constructions
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
- D21G3/00—Doctors
- D21G3/005—Doctor knifes
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Paper (AREA)
- Coating Apparatus (AREA)
- Luminescent Compositions (AREA)
- Diaphragms For Electromechanical Transducers (AREA)
- Preparation Of Compounds By Using Micro-Organisms (AREA)
- Treatment Of Fiber Materials (AREA)
- Lining And Supports For Tunnels (AREA)
Abstract
Creping blade for the detachment of a travelling paper web from a dryer cylinder, said blade having an edge or tip section engaging said cylinder and being constantly hit by the travelling web during its detachment from the cylinder. The invention resides in the improvement of said edge or tip section being provided with a wear-resistant coating on a first part of said edge section hit by the web, the other part of said edge section engaging the cylinder being uncoated or coated with a non-wear-resistant material so that said other part is subjected to sliding wear.
Description
CREPING BLADE
The present invention relates to a creping blade for the detachment of a travelling paper web from a rigid dryer cylinder to form a porous paper product, so called tissue.
Background of the invention Scrapers or doctor blades are extensively used in the paper industry for different purposes but in most of the cases their function is to clean or scrape off mate-rial or residues from the surface of a rotating roll. A
specific application of blades is constituted by their use as creping blades for the manufacture of tissue. Such blades have for a purpose to detach a paper web from a rigid dryer cylinder, usually a cast iron cylinder, by scraping the surface of the cylinder. At the same time the top or edge surface of the blade exerts a compressive action on the paper thereby creating the typical crepe structure of a tissue product.
Since creping blades are subjected to extensive wear different techniques to increase their life time are being used, such as adding wear resistant material onto the section of the blade engaging the cylinder. As an ex-ample of such reinforcement of the top or edge surface of the blade ceramic hardfacings are currently used as a practical solution to reduce the blade wear. Such ceramic coatings are usually applied to blades made of hardened and tempered carbon steel and can be applied by thermal spraying, such as plasma spraying or plating.
Examples of techniques for the provision of such wear-resistant coatings onto doctor blade or scrapers are found in UK patents 978,988, 1 289 609, and 2 130 924.
All this prior art is directed to the provision of a we-ar-resistant coating on the part of the blade engaging the surface of a rotating cylinder.
The present invention relates to a creping blade for the detachment of a travelling paper web from a rigid dryer cylinder to form a porous paper product, so called tissue.
Background of the invention Scrapers or doctor blades are extensively used in the paper industry for different purposes but in most of the cases their function is to clean or scrape off mate-rial or residues from the surface of a rotating roll. A
specific application of blades is constituted by their use as creping blades for the manufacture of tissue. Such blades have for a purpose to detach a paper web from a rigid dryer cylinder, usually a cast iron cylinder, by scraping the surface of the cylinder. At the same time the top or edge surface of the blade exerts a compressive action on the paper thereby creating the typical crepe structure of a tissue product.
Since creping blades are subjected to extensive wear different techniques to increase their life time are being used, such as adding wear resistant material onto the section of the blade engaging the cylinder. As an ex-ample of such reinforcement of the top or edge surface of the blade ceramic hardfacings are currently used as a practical solution to reduce the blade wear. Such ceramic coatings are usually applied to blades made of hardened and tempered carbon steel and can be applied by thermal spraying, such as plasma spraying or plating.
Examples of techniques for the provision of such wear-resistant coatings onto doctor blade or scrapers are found in UK patents 978,988, 1 289 609, and 2 130 924.
All this prior art is directed to the provision of a we-ar-resistant coating on the part of the blade engaging the surface of a rotating cylinder.
Summary of the Invention The present invention is based on an entirely different concept relating to the creping blade design, said concept allowing the blade to be used for a longer period of time while maintaining a substantially constant tissue quality.
Accordingly, tree present invention is directed towards the provision of a new creping blade having a substantially extended lifetime yet allowing the provision of a high tissue quality.
The present invention is also directed towards the provision of a creping blade provided with a wear-resistant coating at the location of the blade hit by the travelling paper web.
The present invention is further directed towards having those parts of the blade engaging the moving cylinder substantially uncovered by such wear-resistant coating to provide for a certain amount of wear of said uncoated part.
The present invention additionally is directed towards the provision of a creping blade designed in such a manner that inspite of the blade wear a substantially constant engagement specific pressure of the blade against the cylinder can be maintained.
In accordance with one aspect of the present invention, there is provided a creping blade for the detachment of a travelling paper web from a dryer cylinder, wherein said blade has an edge or tip section engaging said cylinder and also is constantly hit by the travelling web during its detachment from the cylinder. The improvement according to the present invention is constituted by the fact that said edge or tip section is provided with a wear resistant coating on a first part of said section hit by the web, whereas the other part of said section engaging the cylinder is uncoated or coated with a non-wear-resistant material so that said other part is subject to sliding wear.
In a preferred embodiment of the invention the cre-ping Glade has a thickness of at least about 0.5 mm. The upper extreme of the thickness of the blade is not parti-cularly critical but usually does not exceed 2 to 3 mm. A
particularly practical range is from about 0.8 to about 1.2 mm.
The wear-resistant coating used to reduce the wear on the part of the blade which is hit by the travelling paper web during detachment can suitably be comprised by a ceramic material, but also other wear-resistant materi-als, such as metallic or composite materials, can be used. It is particularly preferred to use a ceramic mate-rial applied by thermal spraying, such as plasma spraying or by a PVD (physical vapour deposition) or CVD (chemical vapour deposition) process.
The wear-resistant coating is preferably comprised of a thermally sprayed material and is suitably selected from metal oxides, silicates, carbides, borides, nitrides and mixtures thereof.
Particularly preferred ceramic materials are selec-ted from alumina, chromic, zirconia, tungsten carbide, chromium carbide, zirconium carbide, tantalum carbide, titanium carbide and borides.
The wear-resistant coating applied in accordance with the present invention has preferably a thickness varying within the range of about 1 to 100 um. However, the coating can have a thickness even exceeding that up-per limit.
The material used in the creping blade according to the present invention is preferably a metal in the form of a strip of metal, polymeric material or composite ma-terial, and it is particularly preferred that such metal strip is comprised of hot or cold rolled steel. It is suitable to use hardened and tempered carbon steel as a material for the blade.
- 35 In another preferred embodiment of the invention the creping blade is comprised of a substantially flat strip having a top or edge surface, a side surface facing the cylinder, a junction section between said surfaces enga-ging said cylinder and a recess in said side surface ex-tending along said junction section and forming a narrow wear land on the junction section, said land being sub-s ject to conformation to the moving cylinder surface.
In such embodiment it is preferred that said recess is designed in such a manner that the wear land surface engaging the cylinder surface remains essentially con-stant throughout the operative cycle of the blade.
Further, in relation to such embodiment the surface of the blade opposite to the wear land is provided with wear-resistant coating to broaden said top or edge sur-face of the blade. This will increase the depth of wear, yet maintaining the creping efficiency and a constant tissue quality.
Said recess may be filled with a non-wear-resistant material. In the alternative said other section is uncoa-ted.
The present invention will now be described more in detail with reference to the appended drawing, wherein Figure 1 is a diagrammatical side section showing the area adjacent to the site of engagement of the blade against a moving cylinder surface;
Figures 2 and 3 illustrate the sliding wear of the blade throughout the life of the blade;
Figure 4 is a diagrammatic side view showing the erosion of the tip of the blade that takes place during operation;
Figure 5 shows in a side view the edge section of a blade provided with a wear-resistant coating;
Figure 6 shows a corresponding side view in section after some wear of the blade tip engaging the cylinder;
Figure 7 shows in a diagrammatic section an embodi-ment of the blade with a modified wear section design;
- 35 and Figure 8 shows another embodiment of a blade tip de-sign based on the same principle.
Figure 1 illustrates the area of engagement between the surface of a moving cylinder 1 and the edge or tip portion of a creping blade 5. Cylinder 1 moves in direc-tion of arrow a) and transports a paper web 3 up to the 5 edge surface 11 of the blade 5. In figure 1 the blade 5 engages the surface of cylinder 1 at the edge 9 joining top surface 11 and a side surface 13 facing the cylinder.
When the paper web 3 hits surface 11 of the blade 5 it is detached from the cylinder and by the compressive action on the paper a typical crepe structure of a tissue pro-duct 7 will be created.
In the practice of producing tissue products two ty-pes of wear take place on the edge section of the blade 5. First, a sliding wear arises at the point of engage-ment of the blade 5 with the moving cylinder surface.
Second, the top or edge surface 11 of the blade 5 which is constantly hit by the paper web 3 will be subjected to extensive wear or erosion as illustrated diagrammatically in figure 4.
Figures 2 and 3 illustrate the situation concerning the first type of wear, namely the sliding wear against the moving cylinder surface. Figure 2 illustrates in the form of a diagram the specific pressure exerted by the blade 5 onto the cylinder surface as a function of time on a logarithmic scale, and by the progression of wear as illustrated in figure 3 the specific pressure decreases at a constant linear load of the blade. The specific pressure applied at.the beginning of the operation is thus very high but decreases with time due to the increa-sed contact area. At point c) the specific pressure against the cylinder is insufficient to insure a proper detachment of the web making a change of blade neces-sary.
Reverting to the second wear, namely the abrasive - 35 action of the web when hitting the edge or top surface 11 of the blade 15, the action of the paper web produces local wear of the blade as shown in figure 4. The geome-trical configuration of the area where the blade 5 is contacted by the web 3 is of high importance for obtai-ning a constant crepe structure. Therefore, the abrasive action of the web when hitting the blade will cause a varying crepe characteristic unless proper measures are taken.
The solution offered by the present invention is il-lustrated by the embodiments shown in figures 5 to 8. The solution to the problem resides in the provision of a blade design, where the section or part of the blade en-gaging the cylinder is not provided with a wear-resistant coating or only provided with a non-wear-resistant coa-ting, whereas the part of the blade edge contacted by the travelling paper web during detachment of said web is coated with a wear-resistant coating. In the embodiment of figure 5 such wear-resistant coating 19, for example a ceramic coating, is provided on the top or edge surface 11 of the blade 5, whereas the side surface 13 of the blade facing the cylinder remains uncoated. Therefore, during operation the outermost part of surface 13 enga-ging the cylinder 1 will be subjected to wear as illust-rated in figure 6 by the wear section of land 7. In this manner by the intentional wear of the blade at the point of engagement with the cylinder 1 the point of abrasive action or erosion where the paper web 3 hits the blade, as illustrated in figure 4, will be moved to the right as the wear progresses, which results in a given crepe cha-racteristic being maintained throughout the operation.
Figure 7 shows an alternative embodiment in regard to the design of the blade tip. In this embodiment the surface 13 facing the cylinder has been provided with a recess extending along the blade to form a narrow wear land or wear surface 17 which will in operation conform to the moving cylinder surface. In this embodiment as can - 35 be seen from figure 7 a constant surface 17 of engagement to the cylinder will be formed throughout the wear period all the way down to the bottom of the recess 15 resulting in maintained specific engagement pressure at a constant linear load of the blade.
To increase the surface of engagement with the tra-velling paper web 3 the blade is provided with a wear-s resistant coating not only on the top or edge surface 11 of the blade but is also provided with wear resistant coating 21 on the side surface of the blade 5 opposite to the wear land 17 and to the inner most part of the recess 15.
Figure 8 shows an embodiment operating according to the same principle as according to figure 7 but with a modified shape of the recess 15. Furthermore, increased blade thickness makes it possible to obtain a long life of the blade without using an exterior wear-resistant coating 21 as in the embodiment shown in figure 7.
A steel blade having a thickness of 1.2 mm and wit hout wear-resistant coating was used in a creping machi ne. The blade had the configuration shown in figure 5 but was not provided with a ceramic coating. The blade was run for about 26 h and was then analyzed from a wear standpoint. The wear land 7 had the shape as shown in fi-gure 6 and a width of about 1 mm. The original 10° nega-tive bevel of the blade edge had, however, changed by erosion creating a varying crepe structure.
L'VTMDT D 7 A second trial was made using the same blade but in this case the blade was provided with a ceramic coating as shown in figures 5 and 6 having a thickness of about 50 um. After the creping operation the blade was analyzed after a period of 26 h of creping operation. The wear land 7 was of the same order of magnitude, about 1 mm, - 35 but due to the presence of the wear-resistant coating on the surface 11 engaged by the travelling paper web 3 no change in the geometry of the site of impact was observed thereby creating a constant crepe structure of the tissue product produced.
The inventive concept as illustrated by the non-limiting examples described above enables the manufacture of a tissue product of constant structure and properties throughout the operation cycle. This is made possible by the use of a blade design where sliding wear aginst the cylinder surface is allowed, thereby creating a moving site of contact between the edge surface 11 of the blade 5 and the travelling paper web 3. The wear-resistant lay-er applied to the blade shall have a thickness which does not interfere with the sliding behaviour. Furthermore, it is preferred to use a relatively thick blade, at least at the tip section thereof, such as 1 mm or more, to allow for a considerable degree of sliding wear.
It is important to note that the present invention is not restricted to the embodiments described with re-gard to blade configuration, blade material, type and character of wear-resistant coating, and it is obvious that various modifications of designs, materials etc. are obvious to the skilled artisan.
Accordingly, tree present invention is directed towards the provision of a new creping blade having a substantially extended lifetime yet allowing the provision of a high tissue quality.
The present invention is also directed towards the provision of a creping blade provided with a wear-resistant coating at the location of the blade hit by the travelling paper web.
The present invention is further directed towards having those parts of the blade engaging the moving cylinder substantially uncovered by such wear-resistant coating to provide for a certain amount of wear of said uncoated part.
The present invention additionally is directed towards the provision of a creping blade designed in such a manner that inspite of the blade wear a substantially constant engagement specific pressure of the blade against the cylinder can be maintained.
In accordance with one aspect of the present invention, there is provided a creping blade for the detachment of a travelling paper web from a dryer cylinder, wherein said blade has an edge or tip section engaging said cylinder and also is constantly hit by the travelling web during its detachment from the cylinder. The improvement according to the present invention is constituted by the fact that said edge or tip section is provided with a wear resistant coating on a first part of said section hit by the web, whereas the other part of said section engaging the cylinder is uncoated or coated with a non-wear-resistant material so that said other part is subject to sliding wear.
In a preferred embodiment of the invention the cre-ping Glade has a thickness of at least about 0.5 mm. The upper extreme of the thickness of the blade is not parti-cularly critical but usually does not exceed 2 to 3 mm. A
particularly practical range is from about 0.8 to about 1.2 mm.
The wear-resistant coating used to reduce the wear on the part of the blade which is hit by the travelling paper web during detachment can suitably be comprised by a ceramic material, but also other wear-resistant materi-als, such as metallic or composite materials, can be used. It is particularly preferred to use a ceramic mate-rial applied by thermal spraying, such as plasma spraying or by a PVD (physical vapour deposition) or CVD (chemical vapour deposition) process.
The wear-resistant coating is preferably comprised of a thermally sprayed material and is suitably selected from metal oxides, silicates, carbides, borides, nitrides and mixtures thereof.
Particularly preferred ceramic materials are selec-ted from alumina, chromic, zirconia, tungsten carbide, chromium carbide, zirconium carbide, tantalum carbide, titanium carbide and borides.
The wear-resistant coating applied in accordance with the present invention has preferably a thickness varying within the range of about 1 to 100 um. However, the coating can have a thickness even exceeding that up-per limit.
The material used in the creping blade according to the present invention is preferably a metal in the form of a strip of metal, polymeric material or composite ma-terial, and it is particularly preferred that such metal strip is comprised of hot or cold rolled steel. It is suitable to use hardened and tempered carbon steel as a material for the blade.
- 35 In another preferred embodiment of the invention the creping blade is comprised of a substantially flat strip having a top or edge surface, a side surface facing the cylinder, a junction section between said surfaces enga-ging said cylinder and a recess in said side surface ex-tending along said junction section and forming a narrow wear land on the junction section, said land being sub-s ject to conformation to the moving cylinder surface.
In such embodiment it is preferred that said recess is designed in such a manner that the wear land surface engaging the cylinder surface remains essentially con-stant throughout the operative cycle of the blade.
Further, in relation to such embodiment the surface of the blade opposite to the wear land is provided with wear-resistant coating to broaden said top or edge sur-face of the blade. This will increase the depth of wear, yet maintaining the creping efficiency and a constant tissue quality.
Said recess may be filled with a non-wear-resistant material. In the alternative said other section is uncoa-ted.
The present invention will now be described more in detail with reference to the appended drawing, wherein Figure 1 is a diagrammatical side section showing the area adjacent to the site of engagement of the blade against a moving cylinder surface;
Figures 2 and 3 illustrate the sliding wear of the blade throughout the life of the blade;
Figure 4 is a diagrammatic side view showing the erosion of the tip of the blade that takes place during operation;
Figure 5 shows in a side view the edge section of a blade provided with a wear-resistant coating;
Figure 6 shows a corresponding side view in section after some wear of the blade tip engaging the cylinder;
Figure 7 shows in a diagrammatic section an embodi-ment of the blade with a modified wear section design;
- 35 and Figure 8 shows another embodiment of a blade tip de-sign based on the same principle.
Figure 1 illustrates the area of engagement between the surface of a moving cylinder 1 and the edge or tip portion of a creping blade 5. Cylinder 1 moves in direc-tion of arrow a) and transports a paper web 3 up to the 5 edge surface 11 of the blade 5. In figure 1 the blade 5 engages the surface of cylinder 1 at the edge 9 joining top surface 11 and a side surface 13 facing the cylinder.
When the paper web 3 hits surface 11 of the blade 5 it is detached from the cylinder and by the compressive action on the paper a typical crepe structure of a tissue pro-duct 7 will be created.
In the practice of producing tissue products two ty-pes of wear take place on the edge section of the blade 5. First, a sliding wear arises at the point of engage-ment of the blade 5 with the moving cylinder surface.
Second, the top or edge surface 11 of the blade 5 which is constantly hit by the paper web 3 will be subjected to extensive wear or erosion as illustrated diagrammatically in figure 4.
Figures 2 and 3 illustrate the situation concerning the first type of wear, namely the sliding wear against the moving cylinder surface. Figure 2 illustrates in the form of a diagram the specific pressure exerted by the blade 5 onto the cylinder surface as a function of time on a logarithmic scale, and by the progression of wear as illustrated in figure 3 the specific pressure decreases at a constant linear load of the blade. The specific pressure applied at.the beginning of the operation is thus very high but decreases with time due to the increa-sed contact area. At point c) the specific pressure against the cylinder is insufficient to insure a proper detachment of the web making a change of blade neces-sary.
Reverting to the second wear, namely the abrasive - 35 action of the web when hitting the edge or top surface 11 of the blade 15, the action of the paper web produces local wear of the blade as shown in figure 4. The geome-trical configuration of the area where the blade 5 is contacted by the web 3 is of high importance for obtai-ning a constant crepe structure. Therefore, the abrasive action of the web when hitting the blade will cause a varying crepe characteristic unless proper measures are taken.
The solution offered by the present invention is il-lustrated by the embodiments shown in figures 5 to 8. The solution to the problem resides in the provision of a blade design, where the section or part of the blade en-gaging the cylinder is not provided with a wear-resistant coating or only provided with a non-wear-resistant coa-ting, whereas the part of the blade edge contacted by the travelling paper web during detachment of said web is coated with a wear-resistant coating. In the embodiment of figure 5 such wear-resistant coating 19, for example a ceramic coating, is provided on the top or edge surface 11 of the blade 5, whereas the side surface 13 of the blade facing the cylinder remains uncoated. Therefore, during operation the outermost part of surface 13 enga-ging the cylinder 1 will be subjected to wear as illust-rated in figure 6 by the wear section of land 7. In this manner by the intentional wear of the blade at the point of engagement with the cylinder 1 the point of abrasive action or erosion where the paper web 3 hits the blade, as illustrated in figure 4, will be moved to the right as the wear progresses, which results in a given crepe cha-racteristic being maintained throughout the operation.
Figure 7 shows an alternative embodiment in regard to the design of the blade tip. In this embodiment the surface 13 facing the cylinder has been provided with a recess extending along the blade to form a narrow wear land or wear surface 17 which will in operation conform to the moving cylinder surface. In this embodiment as can - 35 be seen from figure 7 a constant surface 17 of engagement to the cylinder will be formed throughout the wear period all the way down to the bottom of the recess 15 resulting in maintained specific engagement pressure at a constant linear load of the blade.
To increase the surface of engagement with the tra-velling paper web 3 the blade is provided with a wear-s resistant coating not only on the top or edge surface 11 of the blade but is also provided with wear resistant coating 21 on the side surface of the blade 5 opposite to the wear land 17 and to the inner most part of the recess 15.
Figure 8 shows an embodiment operating according to the same principle as according to figure 7 but with a modified shape of the recess 15. Furthermore, increased blade thickness makes it possible to obtain a long life of the blade without using an exterior wear-resistant coating 21 as in the embodiment shown in figure 7.
A steel blade having a thickness of 1.2 mm and wit hout wear-resistant coating was used in a creping machi ne. The blade had the configuration shown in figure 5 but was not provided with a ceramic coating. The blade was run for about 26 h and was then analyzed from a wear standpoint. The wear land 7 had the shape as shown in fi-gure 6 and a width of about 1 mm. The original 10° nega-tive bevel of the blade edge had, however, changed by erosion creating a varying crepe structure.
L'VTMDT D 7 A second trial was made using the same blade but in this case the blade was provided with a ceramic coating as shown in figures 5 and 6 having a thickness of about 50 um. After the creping operation the blade was analyzed after a period of 26 h of creping operation. The wear land 7 was of the same order of magnitude, about 1 mm, - 35 but due to the presence of the wear-resistant coating on the surface 11 engaged by the travelling paper web 3 no change in the geometry of the site of impact was observed thereby creating a constant crepe structure of the tissue product produced.
The inventive concept as illustrated by the non-limiting examples described above enables the manufacture of a tissue product of constant structure and properties throughout the operation cycle. This is made possible by the use of a blade design where sliding wear aginst the cylinder surface is allowed, thereby creating a moving site of contact between the edge surface 11 of the blade 5 and the travelling paper web 3. The wear-resistant lay-er applied to the blade shall have a thickness which does not interfere with the sliding behaviour. Furthermore, it is preferred to use a relatively thick blade, at least at the tip section thereof, such as 1 mm or more, to allow for a considerable degree of sliding wear.
It is important to note that the present invention is not restricted to the embodiments described with re-gard to blade configuration, blade material, type and character of wear-resistant coating, and it is obvious that various modifications of designs, materials etc. are obvious to the skilled artisan.
Claims (16)
1. Creping blade for the detachment of a travelling paper web from a dryer cylinder, said blade having a section engaging said cylinder and being constantly hit by the travelling web during its detachment from the cylinder, characterized by said section being provided with a wear-resistant coating on a first part of said section hit by the web, and the other part of said section engaging the cylinder lacking wear-resistant material so that said other part is subjected to sliding wear.
2. Creping blade according to claim 1, wherein the blade has a thickness of at least about 0.5 mm.
3. Creping blade according to claim 1 or 2, wherein the wear-resistant coating is comprised of a material selected from ceramics, metallic materials and mixtures thereof.
4. Creping blade according to claim 3, wherein the wear-resistant coating is comprised of a thermally sprayed material.
5. Creping blade according to claim 3, wherein the wear-resistant coating is comprised of a material applied by any one of PVD and CVD.
6. Creping blade according to claim 3 or 4, wherein the ceramic material is selected from metal oxides, silicides, carbides, borides, nitrides, and mixtures thereof.
7. Creping blade according to claim 6, wherein the ceramic material is selected from alumina, chromic, zirconia, tungsten carbide, chromium carbide, zirconium carbide, tantalum carbide, titanium carbide and borides.
8. Creping blade according to any one of claims 1 to 7, wherein said first part of the edge is provided with a coated end surface which forms an angle to said other part of the edge within the range about 45° to 120°.
9. Creping blade according to any one of claims 1 to 8, wherein the wear-resistant coating has a thickness within the range about 1 to 100 µm.
10. Creping blade according to any one of claims 1 to 9, comprising a strip of metal, polymeric material, composite material.
11. Creping blade according to claim 10, wherein said metal strip is comprised of rolled steel.
12. Creping blade according to any one of claims 1 to 7, comprising a substantially flat strip having an edge surface (11), a side surface (13) facing the cylinder, a junction section (9) between said surfaces engaging said cylinder, and a recess (15) in said side surface (13) extending along said junction section and forming a narrow wear land (17) on said junction section conforming to the moving cylinder surface.
13. Creping blade according to claim 12, wherein said recess (15) is designed in such a manner that the wear land surface engaging the cylinder surface remains essentially constant throughout the operative cycle of the blade.
14. Creping blade according to claim 12 or 13, wherein the side surface of the blade opposite to the wear land is provided with wear-resistant coating to broaden said edge surface thereby increasing the depth of wear with maintained creping efficiency.
15. Creping blade according to any one of claims 12 to 14, wherein said recess (15) is filled with a non-wear-resistant material.
16. Creping blade according to any one of claims 1 to 14, wherein said other part of said section is uncoated.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SE9601679-5 | 1996-05-02 | ||
| SE9601679A SE506563C2 (en) | 1996-05-02 | 1996-05-02 | crepe |
| PCT/SE1997/000678 WO1997041299A1 (en) | 1996-05-02 | 1997-04-22 | Creping blade |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2252888A1 CA2252888A1 (en) | 1997-11-06 |
| CA2252888C true CA2252888C (en) | 2004-07-13 |
Family
ID=20402432
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002252888A Expired - Lifetime CA2252888C (en) | 1996-05-02 | 1997-04-22 | Creping blade |
Country Status (9)
| Country | Link |
|---|---|
| US (1) | US6207021B1 (en) |
| EP (1) | EP0906472B1 (en) |
| JP (1) | JP3457679B2 (en) |
| AT (1) | ATE209729T1 (en) |
| CA (1) | CA2252888C (en) |
| DE (1) | DE69708631T2 (en) |
| ES (1) | ES2163766T3 (en) |
| SE (1) | SE506563C2 (en) |
| WO (1) | WO1997041299A1 (en) |
Families Citing this family (29)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6074526A (en) * | 1997-08-18 | 2000-06-13 | Fort James Corporation | Method of creping tissue |
| EP0908309B1 (en) * | 1997-10-08 | 2002-07-24 | Rolf Meyer | Printing squeegee and method for its manufacturing |
| FI980884A (en) * | 1998-04-22 | 1999-10-23 | Valmet Corp | Parts of a paper / cardboard or finishing machine, which are subject to excessive wear and a process for making them |
| FI111343B (en) * | 1998-06-09 | 2003-07-15 | Metso Paper Inc | Scraper blade and blade holder |
| SE0000215L (en) * | 2000-01-25 | 2001-07-26 | Btg Eclepens Sa | Rakelknive |
| SE517846C2 (en) * | 2001-02-16 | 2002-07-23 | Btg Eclepens Sa | Self-adjusting blades |
| SE524103C2 (en) * | 2002-07-15 | 2004-06-29 | Btg Eclepens Sa | Coating sheet and process for making this |
| SE0302400D0 (en) * | 2003-09-08 | 2003-09-08 | Btg Eclepens Sa | Creping leaves |
| WO2005023533A1 (en) * | 2003-09-08 | 2005-03-17 | Btg Eclepens S.A. | Creping blade |
| US20050072540A1 (en) * | 2003-09-12 | 2005-04-07 | Ehv-Weidmann Industries Inc. | System and method for creping electrical insulating paper |
| US7093727B2 (en) * | 2004-09-14 | 2006-08-22 | Musico M James | Plural utensils support system |
| US7431801B2 (en) * | 2005-01-27 | 2008-10-07 | The Procter & Gamble Company | Creping blade |
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| CN101218397B (en) * | 2005-07-01 | 2011-08-17 | Btg埃克莱庞股份有限公司 | Improved coating blade |
| SE529662C2 (en) * | 2005-11-28 | 2007-10-16 | Mattsonfoeretagen I Uddevalla | Coating method and apparatus |
| EP1878565A1 (en) * | 2006-07-13 | 2008-01-16 | BTG Eclépens S.A. | Creping blade |
| US7691236B2 (en) * | 2006-07-26 | 2010-04-06 | The Procter + Gamble Company | Creping blade with a highly smooth bevel surface |
| SE532221C2 (en) * | 2007-02-22 | 2009-11-17 | Cs Produktion Ab | Apparatus and method for creping paper |
| KR100787614B1 (en) | 2007-04-30 | 2007-12-21 | 한국기계연구원 | A creping blade and the manufacturing method for the same |
| AT505661B1 (en) * | 2007-08-03 | 2009-03-15 | Hoessl Peter | SPREADER FOR A CONVEYOR BELT |
| DE102010062901A1 (en) * | 2010-12-13 | 2012-06-14 | Voith Patent Gmbh | Impregnated blade coating |
| EP2896714B1 (en) | 2014-01-17 | 2016-04-13 | voestalpine Precision Strip AB | Creping blade and method for its manufacturing |
| EP3031982B1 (en) * | 2014-12-10 | 2017-03-29 | voestalpine Precision Strip AB | A long life cermet coated crêping blade |
| CN106182906A (en) * | 2016-07-13 | 2016-12-07 | 北京华恩表面工程技术有限公司 | A kind of creping blade and preparation method thereof |
| CN108532352B (en) | 2018-03-26 | 2024-03-29 | 赣州恩创科技有限公司 | Wrinkling cutter and preparation method thereof |
| CN109773598A (en) * | 2019-03-15 | 2019-05-21 | 烟台卓范精密机械设备有限公司 | A kind of production method of scraper |
| DE102019134982A1 (en) * | 2019-12-18 | 2021-06-24 | Clouth Sprenger Gmbh | Design of a creping scraper |
| CA3160380A1 (en) * | 2021-05-26 | 2022-11-26 | Irving Consumer Products Limited | Creping blade for tissue making |
| EP4137304A1 (en) * | 2021-08-16 | 2023-02-22 | Voith Patent GmbH | Blade and creping arrangement |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB978988A (en) * | 1962-12-14 | 1965-01-01 | Lodding Engineering Corp | Doctor blade |
| ZA703701B (en) | 1969-06-16 | 1971-01-27 | Norton Co | Doctor blade |
| US3688336A (en) * | 1970-07-16 | 1972-09-05 | Lodding Engineering Corp | Extended-life doctoring apparatus |
| US3703019A (en) * | 1970-10-15 | 1972-11-21 | Norton Co | Surface conforming wear resistant doctor blade for rolls |
| US4247196A (en) * | 1978-04-26 | 1981-01-27 | Minolta Camera Kabushiki Kaisha | Cleaning device for use in electrophotographic copying machines |
| SE437681B (en) | 1982-10-13 | 1985-03-11 | Inventing Ab | CREATIVE OR RABLE FOR CONTROLLABLE PAIRING AND EXTRAORDINATION OF APPLIANCES ON A CURRENT PAPER COAT |
| SE447362B (en) * | 1985-06-14 | 1986-11-10 | Kanthal Dev Ab | doctor blade |
-
1996
- 1996-05-02 SE SE9601679A patent/SE506563C2/en unknown
-
1997
- 1997-04-22 EP EP97922237A patent/EP0906472B1/en not_active Expired - Lifetime
- 1997-04-22 ES ES97922237T patent/ES2163766T3/en not_active Expired - Lifetime
- 1997-04-22 CA CA002252888A patent/CA2252888C/en not_active Expired - Lifetime
- 1997-04-22 AT AT97922237T patent/ATE209729T1/en active
- 1997-04-22 US US09/171,880 patent/US6207021B1/en not_active Expired - Lifetime
- 1997-04-22 WO PCT/SE1997/000678 patent/WO1997041299A1/en active IP Right Grant
- 1997-04-22 JP JP53879897A patent/JP3457679B2/en not_active Expired - Lifetime
- 1997-04-22 DE DE69708631T patent/DE69708631T2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JP3457679B2 (en) | 2003-10-20 |
| WO1997041299A1 (en) | 1997-11-06 |
| DE69708631D1 (en) | 2002-01-10 |
| ES2163766T3 (en) | 2002-02-01 |
| SE506563C2 (en) | 1998-01-12 |
| CA2252888A1 (en) | 1997-11-06 |
| SE9601679D0 (en) | 1996-05-02 |
| DE69708631T2 (en) | 2002-05-16 |
| EP0906472A1 (en) | 1999-04-07 |
| US6207021B1 (en) | 2001-03-27 |
| JP2000509114A (en) | 2000-07-18 |
| EP0906472B1 (en) | 2001-11-28 |
| ATE209729T1 (en) | 2001-12-15 |
| SE9601679L (en) | 1997-11-03 |
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